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Business Segment Reporting - Schedule of Depreciation and Amortization by Segment (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Segment Reporting Information [Line Items]      
Depreciation expense $ 19,121 $ 31,911 $ 27,202
Amortization of debt discount and issuance costs 6,992 4,512 4,104
Amortization of debt issuance costs 6,992 4,512 4,104
Servicing      
Segment Reporting Information [Line Items]      
Depreciation expense 857 1,925 4,601
Amortization of debt discount and issuance costs 470 71 0
Originations      
Segment Reporting Information [Line Items]      
Depreciation expense 128 93 103
Amortization of debt discount and issuance costs 0 0 0
Corporate Items and Other      
Segment Reporting Information [Line Items]      
Depreciation expense 18,136 29,893 22,498
Amortization of debt discount and issuance costs $ 6,522 $ 4,441 $ 4,104